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Bump acorn from 6.1.1 to 6.4.1
Bumps [acorn](https://github.com/acornjs/acorn) from 6.1.1 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
Signed-off-by: dependabot[bot] <firstname.lastname@example.org>
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